Centaur Chieftain 

Creature — Centaur
$0.15 #28265 0.00 24.6 years
Haste
Threshold — As long as there are seven or more cards in your graveyard, this creature has "When this creature enters, creatures you control get +1/+1 and gain trample until end of turn."
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Cards similar to Centaur Chieftain expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Earthshaker Giant86%
$0.46↑#13915↑0.21↑6.8 years↓
"When this creature enters, other creatures you control get +3/+3 and gain trample until end of turn."
End-Raze Forerunners82%
$0.37↑#1588↑0.31↑7.6 years↓
"When this creature enters, other creatures you control get +2/+2 and gain vigilance and trample until end of turn."
Silver Seraph80%
$0.95↑#261800.0624.3 years
"Other creatures you control get +2/+2 as long as there are seven or more cards in your graveyard."
Nimble Mongoose80%
$0.07↓#267180.0024.9 years
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Anurid Barkripper80%
$0.12↓#270290.41↑24.3 years
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Springing Tiger80%
$0.12↓#308800.0024.9 years
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Krosan Beast80%
$5.27↑#18991↑0.0024.9 years
"This creature gets +7/+7 as long as there are seven or more cards in your graveyard."
Metamorphic Wurm80%
$0.19↑#268390.25↑24.9 years
"This creature gets +4/+4 as long as there are seven or more cards in your graveyard."
Craterhoof Behemoth78%
$21.27↑#306↑1.44↑14.3 years↓
"When this creature enters, creatures you control gain trample and get +X/+X until end of turn, where X is the number of creatures you control."
+1 more matching line
Overrun78%
$0.15#1711↑0.27↑28.9 years↑
"Creatures you control get +3/+3 and gain trample until end of turn."
Overcome78%
$0.06↓#12434↑0.069.1 years↓
"Creatures you control get +2/+2 and gain trample until end of turn."
Rumbleweed76%
$2.93↑#6107↑0.17↑2.4 years↓
"When this creature enters, other creatures you control get +3/+3 and gain trample until end of turn."
Billowing Shriekmass76%
$0.18↑#17762↑0.081.8 years↓
"This creature gets +2/+1 as long as there are seven or more cards in your graveyard."
Tromp the Domains76%
$0.15#228820.11↑19.9 years↓
"Until end of turn, creatures you control gain trample and get +1/+1 for each basic land type among lands you control."
Childhood Horror75%
$0.17↑#289750.22↑24.9 years
"As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and can't block."
Frightcrawler75%
$0.17↑#256220.0024.9 years
"As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and can't block."
Stampede Driver74%
$0.15#247220.0026.6 years↑
"
,
, Discard a card: Creatures you control get +1/+1 and gain trample until end of turn."
Spectral Hunt-Caller74%
$0.23↑#238610.003.8 years↓
"
: Creatures you control get +1/+1 and gain trample until end of turn."